CN102282885A - System and method for enabling wireless communications with cell coordination - Google Patents
System and method for enabling wireless communications with cell coordination Download PDFInfo
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- CN102282885A CN102282885A CN201080003843.7A CN201080003843A CN102282885A CN 102282885 A CN102282885 A CN 102282885A CN 201080003843 A CN201080003843 A CN 201080003843A CN 102282885 A CN102282885 A CN 102282885A
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- H04W72/04—Wireless resource allocation
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- H04W—WIRELESS COMMUNICATION NETWORKS
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Abstract
A system and method for enabling wireless communications with cell coordination is provided. A method for communications controller operation includes transmitting a reference signal, and receiving a report from at least one communication device. The communications device is served by the communications controller, and the report includes an indicator of a preferred precoding matrix. The method also includes receiving a downlink (DL) transmission intended for the communications device, scheduling a transmission opportunity for the communications device, and transmitting the DL transmission to the communications device. The scheduling is based on the received report, and the received transmission is transmitted at an occurrence of the transmission opportunity.
Description
The present invention requires on January 13rd, 2009 to submit, denomination of invention is the U.S. Provisional Patent Application of " being used for coordinate realizing by the sub-district system and method for the radio communication of restriction PMI scheduling " (System and Method for Implementing a Restricted PMI Scheduler with Cell Coordination) number 61/144, on January 12nd, 370 and 2010 submitted, denomination of invention is the U.S. Patent number 12/686 of " being used to enable the system and method with radio communication of coordinating the sub-district " (System and Method for Enabling Wireless Communications with Cell Coordination), 043 in the first to file priority, should incorporate among the Ben Wenben in the mode of introducing in content of first to file.
Technical field
The present invention is relevant with radio communication usually, and more particularly, the system and method with radio communication of coordinating the sub-district is relevant with being used to enable.
Background of invention
Usually, use the wireless communication system of wave beam forming to utilize a plurality of emissions and/or reception antenna and signal processing to create fixing and adaptive emission/received beam figure.Beam pattern can have directional characteristic, when relatively the time, causing the raising of performance with unidirectional emission and/or reception antenna.The use of beam pattern can cause obtaining the emission/receiving gain that covers wireless communication system when using unidirectional emission and/or reception antenna.
Similarly, wave beam forming has been extended to a promising technology, is used to increase the sub-district covering and improves the cell edge spectrum efficiency.But a major defect of wave beam forming is so-called flashlight effect, and wherein, because the change of the beam pattern of the neighbor cell that is disturbed, the channel quality between subscriber equipment (UE) measurement and report and NodeB (NB) emission also can change.
Other terms commonly used and that can exchange mutually usually that are used for UE may comprise " travelling carriage ", " user ", " terminal ", " access terminal ", " user " or the like, and " controller ", " base station ", " enhancement mode NodeB ", " terminal base station " or the like are the generic terms that is used for NB.
Wave beam forming/handoff advice that people will coordinate (please refer to C80216m-08_487 as the possible solution of this problem, the title of Alcatel_Lucent is " based on the light beam (GoB) of the grid of downlink multiuser MIMO " (Grid-of-Beams (GoB) Based Downlink Multi-User MIMO), IEEE802.16m, in May, 2008; With " being used for the suggestion of LTE advanced techniques " (Proposals for LTE-Advanced technologies) R1-082575 of NTT DoCoMo, Warsaw, Poland, 30 days-July 4 June in 2008).
Wave beam switches and can provide good performance in the heavier sub-district of load, can best benefit from the UE that there is limited numbers of beams in band somewhere because exist all the time.Guarantee for each wave beam by the NB emission the heavier sub-district of load, all can have the UE of the wave beam that will launch as preferred wave beam report.
Summary of the invention
Have the radio communication that coordinate the sub-district by having enabled, the system and method in the embodiment of the invention can solve or avoid the problems referred to above and other problems usually, and can realize technical advantage usually.
According to an embodiment, provide one to be used for the communication controler method of operating.This method comprises transmitted reference signal, and receives report from least one communication equipment.This communication equipment is served by communication controler, and this report comprises the designator of preferred pre-coding matrix.This method also comprises the down link of selecting to be used for communication equipment (DL) and launches, is emitted to communication equipment for communication equipment scheduled transmission chance and with DL.This scheduling feature is based on the report that receives, and emission DL emission when launching opportunity occurring.
According to another embodiment, provide one to be used for the communication equipment method of operating.This method comprises measurement by the reference signal of communication controler emission, determine preferred pre-coding matrix, preferred pre-coding matrix is reported to communication controler and receives emission from communication controler based on the measurement of reference signal.Communication controler is just being served communication equipment, and this emission is carried out precoding by preferred pre-coding matrix or with another pre-coding matrix that preferred pre-coding matrix belongs to the same beam group.
According to another embodiment, provide a communication controler.Communication controler comprises the processor that is configured to executive program and application program, the memory that transmits and receives circuit, is coupled to the scheduler of processor and is coupled to processor that is coupled to this processor and an antenna.This transmits and receives emission that processing of circuit receives and prepares emission, memory stores application program, program and wave beam group for emission.Scheduler is based on the preferred pre-coding matrix by the communication node report, and scheduling is to the emission of at least one communication node.This emission to communication node is at the wave beam corresponding with preferred pre-coding matrix or belongs to the wave beam that also comprises with the wave beam group of the corresponding wave beam of preferred pre-coding matrix and dispatch.
The advantage of this embodiment is, the wave beam performance of handoffs can be in the lighter communication system of load, by or do not realize by between NB, coordinating.
Another advantage of present embodiment is, for the UE scheduling provides the flexibility that increases, because all wave beams in single group all can be used for dispatching UE rather than single wave beam.The wave beam group may be defined as optimizes the contrast of coordinating with the gain of multi-user's diversity.
Another advantage of present embodiment is, the traversal wave beam can be carried out by synchronous mode, and method is the cluster traversal wave beam group by NB, wherein can carry out circulation with minimize interfere and NB between the space collision.
Next this paper summarized function of the present invention and technical advantage, so that understand the detailed description of follow-up embodiment better.Hereinafter, will describe greater functionality of the present invention and advantage, they have formed the theme of claim of the present invention.It should be appreciated by those skilled in the art that on the basis of the notion that can disclose herein and specific embodiment and revise and design other structures or flow process, so that realize the purpose identical with the present invention.Those skilled in the art should also be understood that such equivalent construction should not deviate from the spirit and scope of the invention described in the claim of built-in of the present invention.
The accompanying drawing summary
In order more completely to understand embodiments of the invention and advantage thereof, can with reference to the following drawings and illustrate, wherein:
Fig. 1 is the chart from the possible sky wave beam of a plurality of antennas;
Fig. 2 a is the wave beam pattern diagram of a plurality of wave beams;
Fig. 2 b is the main lobe pattern of a plurality of wave beams;
Fig. 2 c is the chart by the CQI (CQI) of UE report;
Fig. 3 a is the application drawing of two UE moving in two adjacent NB;
Fig. 3 b is the chart of wireless communication system;
Fig. 3 c is the chart of NB;
Fig. 4 a is the chart of cell layout of trooping;
Fig. 4 b is for dispatching the flow chart that coordinative role is operated with the scheduler that is used for the sub-district cluster with limited/grouping PMI;
Fig. 4 c is the chart of the sector part of being dispatched by the scheduler of the NB in the cluster of 19 NB during launching opportunity is arranged;
Fig. 4 d is for carrying out the flow chart that scheduler is operated with the limited/grouping PMI that has coordinated in dispatching for the sub-district cluster;
Fig. 4 e be scheduler by NB in the cluster of 19 NB, the chart of the sector part of during launching opportunity is arranged, dispatching;
Fig. 5 is the flow chart of the UE operation in limited/grouping PMI scheduling;
Fig. 6 is the flow chart of the NB operation in limited/grouping PMI scheduling;
Fig. 7 a is in limited/grouping PMI scheduling, under situation about not coordinating with other NB, and the flow chart of the NB operation of scheduling UE;
Fig. 7 b is in limited/grouping PMI scheduling, under situation about coordinating with other NB, and the flow chart of the NB operation of scheduling UE;
In the PMI scheduling of Fig. 8 for not coordination and restricted/grouping of having coordinated, UE properties data figure.
Embodiment
Making and the use of embodiment have been gone through below.Should be appreciated that, the invention provides many applicable inventive concepts, can in a large amount of specific environments, implement.These specific embodiments of being discussed have only illustrated making and have used ad hoc fashion of the present invention, do not limited four corner of the present invention.
These embodiment describe in specific environment, mainly are to use wave beam forming to be emitted to the wireless communication system with NodeB (NB) of the subscriber equipment (UE) that uses directional beam figure, and wherein, the emission of NB may or may be not synchronized with each other.The present invention can be applied to and use wireless access technology widely for example in the wireless communication system of LTE, LTE-Advanced or the like.In addition, the present invention also can be applicable to use the NB of non-directional beam pattern.
Fig. 1 has illustrated the possible wave beam from a plurality of antennas.As shown in fig. 1, four directional antenna beams are arranged, for example: directional antenna beams " BEAM 1 " 105, directional antenna beams " BEAM 2 " 110, directional antenna beams " BEAM 3 " 115 and directional antenna beams " BEAM 4 " 120, they correspond respectively to different transmitting antennas.Fig. 1 has also described a comprehensive wave beam 125, can be corresponding to the use of all antennas in a plurality of antennas, so that the signal that emission will be launched.Wave beam (wave beam 105 to 120) can be used to be emitted to the UE that particular beam is reported as preferred wave beam by NB.
But, in the lighter sub-district of load, there is not any UE in each wave beam of possible NB emission, from pre-coding matrix indication (the precoding matrix indication of UE report, PMI) can provide overall preferably performance, particularly use the communication system of large-scale code book.In PMI report, each UE all have an opportunity to use each scheduling moment the wave beam corresponding with its preferred PMI dispatch.
Therefore, the additional flexibility that provides in the scheduling of UE and by the wave beam of NB emission can provide and PMI report similar performance, and avoiding interfering and coordinating of providing in the wave beam of having coordinated switches is provided.Can switch with wave beam the conditional use of PMI report and to combine, the performance of switching with the wave beam that improves in the lighter sub-district situation of load.The PMI report of limited use is used in combination with the wave beam switching, can be described as limited/grouping PMI scheduling.
Fig. 2 a has described the drawing (plot) 200 of the beam pattern of a plurality of wave beams.The beam pattern of the wave beam of the code book that uses has been described in drawing 200 in LTE.Code book comprises eight wave beams, comprises wave beam " N1 " 205, wave beam " N2 " 207, wave beam " N3 " 209, wave beam " N4 " 211, wave beam " N5 " 213, wave beam " N6 " 215, wave beam " N7 " 217 and wave beam " N8 " 219.Eight wave beams that show among Fig. 2 a can be divided into three wave beam groups, and wherein each wave beam group has covered 40 degree parts of one 120 degree sector.First wave beam group 225 refers to the center stack of span from-20 degree to+20 degree, and comprises wave beam " N1 " 205, " N5 " 213 and " N8 " 219.Second wave beam group 227 becomes left group, span be from-60 degree to-20 degree, comprise wave beam " N4 " 211 and " N7 " 217, and the 3rd wave beam group 229 is called right group, span be from+20 degree to+60 degree, and comprise wave beam " N2 " 207 and " N6 " 215.Wave beam " N3 " 209 can be comprehensive wave beam, can be used in limited/grouping PMI scheduling.Therefore, wave beam " N3 " 209 can save from any one of this three wave beam groups.
Switch opposite, limited/grouping PMI scheduling with wave beam and can use a large amount of wave beams, the sector of the potential covering smaller portions of each wave beam.In addition, wave beam can be based on sector coverage area, and subregion is the wave beam group.Wave beam in the single wave beam group can be used for exchanging mutually each other, and can not cause tangible performance to reduce or significantly performance increase.
Though the discussion among Fig. 2 a illustrated have a code book and comprise the communication system that subregion is eight wave beams of three wave beam groups, this embodiment can use the wave beam (but subregion is the wave beam group of any amount, needs only in each group to have a wave beam at least) of code book and any amount to operate.Usually, can select a plurality of subregions, so that each wave beam group has two or more wave beams.If each wave beam group has a single wave beam, then limited/grouping PMI scheduling feature can become the wave beam handoff functionality.Therefore, should not analyze scope or essence with having the discussion of code book that subregion is eight wave beams of three wave beam groups into the restriction present embodiment.
Fig. 2 b is the drawing 240 of the main lobe of a plurality of wave beams.As shown in Fig. 2 b, but nine wave beam subregions are three wave beam groups (center stack 245, left group 247 and right group 249), every group of three wave beams.Though be shown as the part that approximately equates of striding the sector, still can carry out subregion, so that the wave beam group can be striden the different piece of sector to the wave beam group.For example, in the grouping of emergency antenna wave beam, the central wave bundle group can be striden the bigger part in sector than left side wave beam group or right side wave beam group.
Fig. 2 c has described the chart by the CQI (CQI) of UE report.Fig. 2 c has also described the scheduling of the subframe in the time-domain.CQI is reported that by a plurality of UE different subframes is all had demonstration.For example, at subframe 255 places, the CQI of UE1 report is 10, and the CQI of UE2 report is 3.5, and the CQI of UE3 report is 3, and the CQI of UE4 report is 20.Emphasize to have less sub-squares with dash box for each UE shows maximum CQI, the maximum CQI of UE1, UE2, UE3 and UE4 is respectively 10,5,10 and 100.Transregional 260 and 265 have emphasized two wave beam group circulations respectively.
For each UE in transregional 260 produce the subframe of maximum CQI may not can for producing identical CQI among each UE in transregional 265.For example, in transregional 260, UE1 has reported maximum 10 CQI, but in transregional 265, UE has reported maximum 11 CQI.Difference among the maximum CQI may cause NB at the different wave beam of wave beam group internal emission.Though maximum CQI value may be different, remain consistent at two between transregional with the corresponding subframe of maximum CQI between transregional.
Fig. 3 a has described the operation of two UE that move in two adjacent NB.First UE " UE1 " 305 can measure the transmission from first NB " NB1 " 315, and second UE " UE2 " 310 can measure from the transmission of second NB " NB2 " 320 to determine best CQI, and it can send report to its corresponding service NB.Can use different antenna beams in the different time by the transmission that NB generates.Then, can use wave beam in the wave beam group, carry out according to the PMI that reports to NB by UE to the transmission of UE.As an example, if second PMI that UE 310 reports corresponding to the wave beam of given wave beam group, then its service NB (NB 320) can select to use any wave beam of given wave beam group inside to dispatch second UE 310.If possible, service NB can select the wave beam (that is, the wave beam of having reported) of second UE, 310 reports, may needn't use the wave beam of having reported but serve NB.
Fig. 3 b has illustrated wireless communication system 350.Wireless communication system 350 comprises a plurality of NB (for example: NB 355, NB 356 and NB 357).Each NB can be responsible for giving UE, for example its UE that is serving 360, UE 361, UE 362 and UE 36 with Resource Allocation in Networks.For example, NB can be transmitted to the transmission of the UE that is used for serving or give UE with some Resource Allocation in Networks, so that UE can launch information.
Some or all of NB in the wireless communication system 350 can operate in limited/grouping PMI scheduling method.The NB that operates can be described as and use subclass among all NB in the PMI scheduling method of restricted/grouping, since that not every NB needs to share is limited/the PMI scheduling method divides into groups.Each can launch pilot tone the NB that operates in limited/grouping PMI scheduling method.Then, this NB can receive preferred PMI from its UE that is serving.The PMI that receives from UE can have or not have to be dispatched to the transmission of UE under the situation about coordinating with other NB.
In wireless communication system 350, under the situation that not all NB operates in limited/grouping PMI scheduling method, if then NB has not the adjacent NB (for example: adjacent NB can operate in the multiplexed or diversity mode at subregion) that operates in the PMI scheduling method of restricted/grouping, then the CQI that is undertaken by the UE of NB measures the influence of the transmission that can be subjected to being undertaken by adjacent NB (generation of this transmission use with by NB pilot transmitted identical time and frequency).
Though each NB or each sub-district all have wave beam group circulation pattern at different sections, may there be wave beam group circulation pattern of overall importance in all NB in limited/grouping PMI scheduling method.The controller 365 that is connected to NB can be specified the global beam group circulation pattern stage based on the independently wave beam group circulation pattern stage from each NB or sub-district.The minimum multiple in wave beam group circulation pattern stage independently that the global beam group circulation pattern stage may be all.For example, if three NB carry out subregion in limited/grouping PMI scheduling method, have four (4), four (4) and (8) individual wave beam group circulation pattern stage respectively, then the global beam group circulation pattern stage may be eight (8).Perhaps, global beam group circulation pattern subregion can be 16,24 or the like.
Fig. 3 c has described NB 375.NB 375 can control from and the communicating by letter of the UE that is serving to it.NB 375 can operate in a plurality of operator schemes, comprises limited/grouping PMI scheduling.NB 375 comprises processor 380, can be used for running application and project.Processor 380 also can be carried out the coordination with the controller of other NB or NB, to determine wave beam group circulation pattern.Below, how more detailed description is determined wave beam group circulation pattern.
NB 375 also comprises emission/receiving circuit 382, can be used for handling the information that will launch and handles the information that has received.For example, emission/receiving circuit 382 can filter, amplification, error detection, coding, decoding or the like information.Information can receive by the mode of antenna 384 or launch.Though shown individual antenna, antenna 384 can be the aerial array of a plurality of antennas.
NB 375 also comprises scheduler 386, can be used for to the emission of being used the UE schedule information/data of serving of the wave beam in the wave beam group by NB 375.Scheduler 386 can be maybe cannot be coordinated its wave beam group and adjacent NB.Scheduler 386 also can utilize the transmission that is dispatched to UE from the PMI of UE reception.Though scheduler 386 preferably utilizes the preferred wave beam (with the corresponding wave beam of PMI of UE emission) of UE, scheduler 386 can utilize the replacement wave beam in the wave beam group identical with the preferred wave beam of UE.For example, scheduler 386 can select to use alternative wave beam, if more UE has reported that it is more prone to select to use standby wave beam.
Limited/grouping (Restricted/grouped) PMI scheduling also can utilize coordination between the NB with the interference between the further minimizing NB, and reduces the space concussion between the transmission among the NB.For example, which wave beam group the coordination between the NB can help to select to be utilized in some transmission opportunity by which NB.
Fig. 4 a illustrates the cell layout 400 of trooping.Cluster cell layout 400 comprises seven sub-districts, and (for example: sub-district 405), wherein each sub-district (for example: the sector 410 of sub-district 405) is divided into three sectors.Each sector also is further divided into three parts (left part 416 of the sector 410 of middle body 415, sub-district 405 and right side part 417).As shown in Fig. 4 a, central sector can be striden than left part and the bigger sector part of right side part.The wave beam group that is used to cover middle body can comprise more multi-beam, or independently strides the wave beam than the bigger zone of wave beam group that is used to cover left part or right side part.
Observation to cluster cell layout 400 shows, at the middle body of cell sector (for example: the synchronized transmissions of carrying out middle body 415), never can bump, (for example: the left part 416) synchronous transmission of carrying out then may cause the collision of three directions and in the left part of cell sector.Equally, (for example: the right side part 417) synchronized transmissions of carrying out may cause the collision of three directions in the right side of cell sector part.And the synchronized transmissions of carrying out in the right side part of the left part of cell sector and cell sector can not bump.
Though discuss among Fig. 4 a be absorbed in have three sectors, sub-district that each sector has three parts, embodiment herein can be applicable to have the sub-district that the sector of any amount, part that each sector has any amount and every part have the different piece ratio.In addition, these sub-districts can have the sector of varying number, and each sector has the part of varying number.Therefore, should will not have the sub-district that subregion is three sectors, the discussion that the sector has three parts, analyze scope or essence into the restriction present embodiment.
Coordination between the NB helps to be used for the time division multiplexing of central authorities, left side and right side part by use, and (time-division multiplexing TDM), reduces and/or stop collision between the transmission of carrying out in each sector part.The use of TDM is independent of a plurality of antennas.Can know the independent number of antenna and corresponding measurement CQI by the UE of NB service.For example, UE can based on its selected PMI and in transmission opportunity corresponding to interference that launched and measurement selected PMI, be wave beam report CQI.
Fig. 4 b is for operating 420 flow chart with limited/grouping PMI scheduling coordinative role with the scheduler that is used for the sub-district cluster.Scheduler operation 420 can be indicated the operation in the scheduler of the NB in cluster NB, and wherein, NB operates in limited/grouping PMI scheduling, so that and coordinate between the NB among the cluster NB.The scheduler operation that can take place after coordinating 420 is carried out in by the NB between the NB among the cluster NB, and is responsible for the controller of coordination between having between the NB in cluster NB.
According to an embodiment, scheduler operation 420 is descriptive for the cluster NB with 19 NB, and wherein each NB is as the NB (each sector has three parts) with three sectors.Scheduler operation 420 can be used for revising the cluster of the NB of other sizes and/or sector/portion arranged.Therefore, should be with 19 NB clusters of NB, wherein each NB has the NB of three sectors and the discussion that each sector has three parts, analyzes scope or essence into the restriction present embodiment.
19 NB clusters of NB can be arranged in a plurality of a plurality of concentric rings that originate in central NB place.Fig. 4 c has described the cluster that comprises 19 NB 430.As shown in Fig. 4 c, 430 the cluster of 19 NB comprises central NB 435, and it is surrounded by the inner ring with 6 NB436 of central NB 435 next-door neighbours.The inner ring of 6 NB is surrounded by the outer ring with 12 NB 437 of 6 inner rings next-door neighbour.
Turn back to Fig. 4 b now, scheduler operation 420 can begin at first transmission opportunity place, and wherein all NB can be for reporting that the UE that selected PMI belongs to the middle body (piece 425) of the sector of sub-district dispatches.Begin the place in first transmission opportunity ending and second transmission opportunity, for fear of the transmission collision taking place and disturbing, NB of central authorities and the NB that is arranged in the outer ring of 12 NB can dispatch reporting the UE that selected PMI belongs to the left half of cell sector, and the NB that is arranged in the inner ring of 6 NB can dispatch the UE of the right side part (piece 427) of reporting the sector that selected PMI belongs to the sub-district.
Begin the place in second transmission opportunity ending and the 3rd transmission opportunity, for fear of the transmission collision taking place and disturbing, NB of central authorities and the NB that is arranged in the outer ring of 12 NB can dispatch the UE that reports the right side part that selected PMI belongs to cell sector, and the NB that is arranged in the inner ring of 6 NB can dispatch reporting the UE that selected PMI belongs to the left part of the sector of sub-district (piece 427).Scheduler operation 420 can be carried out repetition in a looping fashion.7 for example, every 3N launching opportunity (N=0,1 ...) can be corresponding to first transmission opportunity, and every (3N+1) individual launching opportunity can be corresponding to second transmission opportunity, every (3N+2) individual transmission opportunity can be corresponding to the 3rd transmission opportunity.
Fig. 4 c has described the sector part of being dispatched by the scheduler of the NB in the cluster of 19 NB 430 in the 3rd transmission opportunity, wherein dotted portion be left part, dashed area as the right side part, do not have hatched part as the part of not dispatching.
Fig. 4 d is for operating 440 flow chart with limited/grouping PMI scheduling coordinative role with the scheduler that is used for the sub-district cluster.Scheduler operation 440 can be indicated the operation in the scheduler of the NB in cluster NB, and wherein, NB operates in limited/grouping PMI scheduling, so that and coordinate between the NB among the cluster NB.The scheduler operation that can take place after coordinating 440 is carried out in by the NB between the NB among the cluster NB, and has the controller of being responsible for coordination between the NB in cluster NB.
According to an embodiment, scheduler operation 440 is descriptive for the cluster NB with 19 NB, and wherein each NB is as the NB (each sector has three parts) with three sectors.Scheduler operation 440 can be used for revising the cluster of the NB of other sizes and/or sector/portion arranged.Therefore, should be with 19 NB clusters of NB, wherein each NB has the NB of three sectors and the discussion that each sector has three parts, analyzes scope or essence into the restriction present embodiment.
Scheduler operation 440 can begin at first transmission opportunity place, and wherein all NB can be for reporting that the middle body UE (piece 445) that selected PMI belongs to the sector of sub-district dispatches.Begin the place in first transmission opportunity ending place and second transmission, for fear of the transmission collision taking place and disturbing, the NB of the even number of the Odd number NB of centre circle of central authorities NB, 6 NB and the outer ring of 12 NB can dispatch the UE of PMI of the left part of the selected sector that belongs to the sub-district of report, and the NB of the Odd number of the outer ring of the NB of the even number of six adapter rings part and 12 NB can dispatch the UE of the PMI of the selected right side part (piece 447) that belongs to the sector of sub-district of report.NB in the circle is numbered from zero to N-1 serially, and wherein, N is the quantity (example) of the NB in the circle.
Begin the place in second transmission opportunity ending place and the 3rd transmission, for fear of the transmission collision taking place and disturbing, the NB of the even number of the Odd number NB of the mesosphere of central authorities NB, 6 NB and the outer ring of 12 NB, can dispatch the UE of PMI of the right side part of the selected sector that belongs to the sub-district of report, and the NB of the Odd number of the outer ring of the NB of the even number of six mesospheres part and 12 NB can dispatch the PMI (piece 449) of the right side part of the selected sector that belongs to the sub-district of report.Scheduler operation 440 can be carried out repetition in a looping fashion.7 for example, every 3N transmission opportunity (N=0,1 ...) can be corresponding to first transmission opportunity, and every (3N+1) individual transmission opportunity can be corresponding to second transmission opportunity, every (3N+2) individual transmission opportunity can be corresponding to the 3rd transmission opportunity.
Fig. 4 e has described the part of the sector of being dispatched by the scheduler of the NB in the cluster of 19 NB 450 in the 3rd transmission opportunity, wherein dotted portion be left part, dashed area as the right side part, do not have hatched part as the part of not dispatching.
Fig. 5 is the flow chart of the UE operation in limited/grouping PMI scheduling.UE operation 500 can be designated as the operation that takes place in its/grouping PMI scheduling limited by participating in UE NB serves.UE operation 500 can take place when UE is served by NB, and NB continues to participate in the PMI scheduling of restricted/distribution.
Because preferred PMI can select from the pilot tone of non-wave beam forming or RS, measurement can be the accurate demonstration of the communication channel between NB and the UE.In addition, UE has the bigger degree of freedom aspect preferred picking up PMI from code book.Preferred PMI can be corresponding to generating the wave beam that maximum channel is measured.Then, based on the preferred PMI that has reported, this UE can receive by the pre-coding matrix corresponding with preferred PMI or belong to and pre-coding matrix that preferred PMI (piece 515) is positioned at same wave beam group carries out the transmission of wave beam forming.Then, UE operation 500 can stop.
Fig. 6 is the flow chart of the NB operation 600 in limited/grouping PMI scheduling.Limited/grouping PMI scheduling that NB operation 600 can participate at it and when serving one or more UE is illustrated in the operation that takes place among the NB.NB operation 600 can be that UE takes place when serve by NB at NB, and that NB continues to participate in is restricted/and during the PMI that distributes dispatches.
The scheduling of the transmission of UE can be taken place having or do not have under the situation about coordinating with adjacent NB.If do not carry out any coordination, then this NB can under the situation of the interference of not considering to be caused by adjacent NB, utilize wave beam and wave beam group based on self internal sort.If carried out coordination, then NB can utilize wave beam and wave beam group based on the wave beam group circulation pattern of determining during coordinating.Detailed description to the scheduling of the transmission of UE (having and do not have coordination) is provided below.
In case dispatched UE, then when the transmission opportunity of having dispatched that UE occurs being used for (piece 620), NB can be emitted to UE.Then, UE operation 600 can stop.
Fig. 7 a illustrated in limited/grouping PMI scheduling, under situation about not coordinating with other NB, and the flow chart of the NB operation 700 of scheduling UE.Limited/grouping PMI scheduling that NB operation 700 can participate at certain NB and not and other NB universal time coordinateds, the operation that in this NB, takes place.Especially, NB operation 700 can take place in the scheduler of NB, because it dispatches this UE based on the preferred PMI by the UE report.NB operation 700 can be that UE takes place when serve by NB at NB, and NB continues to participate in during limited/grouping PMI dispatches.
After selecting the wave beam group, this NB can only select to have reported according to the wave beam in the wave beam group the UE (piece 710) of preferred PMI.This UE can select based on condition (for example: the quality of the quantity of buffer information, UE priority, historical information, service request, wave beam function, be used for diversity gain or the like) more.Selected UE can dispatch and use one or more wave beams of wave beam group to come (piece 715) dispatched in transmission.NB can be from the one or more wave beams of wave beam group selection, so as based on PMI, the wave beam function of the grouping of the quantity of selected UE, selected UE, selected UE report, be used for diversity gain or the like more), in its emission, use.
After selected UE scheduling was entered selected wave beam group, NB can carry out inspection and select and dispatch (piece 720) to have determined whether more wave beam group.If there is not additional wave beam group to be used for selecting and scheduling, then NB can turn back to piece 705, selects another wave beam group and selected wave beam group is carried out the UE scheduling can repeat being used to.If be not used in the more multi-beam group of selecting and dispatching, then NB operation 700 may stop.
Fig. 7 b illustrated in limited/grouping PMI scheduling, under situation about coordinating with other NB, and the flow chart of the NB operation 750 of scheduling UE.Under limited/grouping PMI scheduling that NB operation 750 can participate at NB and the situation about not coordinating with other NB, be illustrated in the operation that takes place among this NB.Especially, NB operation 750 can take place in the scheduler of NB, because it dispatches this UE based on the preferred PMI by the UE report.As long as NB has the UE that can serve, NB operation 750 just can take place, and in NB continues to participate in limited/grouping PMI scheduling.
Then, this NB can select the wave beam group based on wave beam group circulation pattern and its transmission opportunity of dispatching (piece 760).For example, NB can be restricted to based on a plurality of transmission opportunitys and select the particular beam group.After selecting the wave beam group, this NB can only select to have reported according to the wave beam in the wave beam group the UE (piece 765) of preferred PMI.This UE can select based on condition (for example: the quality of the quantity of buffer information, UE priority, historical information, service request, wave beam function, be used for diversity gain or the like) more.Selected UE can dispatch and use one or more wave beams of wave beam group to come (piece 770) dispatched in transmission.NB can be from the one or more wave beams of wave beam group selection, so as based on PMI, the wave beam function of the grouping of the quantity of selected UE, selected UE, selected UE report, be used for diversity gain or the like more), in its emission, use.
After selected UE scheduling was entered selected wave beam group, NB can carry out inspection and select and dispatch (piece 775) to have determined whether more wave beam group.If there is not additional wave beam group to be used for selecting and scheduling, then NB can turn back to piece 760, selects another wave beam group and selected wave beam group is carried out the UE scheduling can repeat being used to.If be not used in the more multi-beam group of selecting and dispatching, then NB operation 750 may stop.
Fig. 8 has described the PMI scheduling of the restricted/grouping that is used for not coordinating and has coordinated, UE properties data figure.Limited/grouping PMI scheduling of not coordinating and having coordinated (respectively shown in first track 805 and second track 810) has been shown that it is about 20 percent that this coordination can cause the overall average throughput gain, and cell edge throughput gain and big by 3 percent.The use subregion is that the code book of eight wave beams of three wave beam groups is assessed communication system.The summary of table 1 expression communication system configuration, the summary of table 2 expression results of property.
Table 1: communication system setting.
Table 2: results of property.
| Do not coordinate | Coordinate | |
| Average throughput (bps/Hz) | 2.2165 | 2.6664 |
| |
0 | 20.30 |
| 5% cell edge throughput (bps/Hz) | 0.1149 | 0.1192 |
| Gain % | ?0 | 3.75 |
Though described embodiments of the invention and advantage thereof in detail, but it must be understood that, under the situation that does not deviate from defined essence of accessory claim of the present invention and scope, those skilled in the art can design different flexible program of the present invention or it is changed, replaces.In addition, the scope of present patent application is not limited to the specific embodiment of formation, mode, method and the step of process, equipment, manufacturer, material described in standard.Those skilled in the art can understand from the content that the present invention discloses, the formation of process, machine, manufacturer, material, mode, method or step, no matter be to have or remain to develop in the future, as long as can carry out identical functions or realize identical result with the embodiment that describes herein in fact, all can utilize according to the present invention.Correspondingly, the claim of built-in is used for containing in its scope formation, mode, method or the step of this class process, equipment, manufacturer, material herein.
Claims (20)
1. one kind is used for the communication controler method of operating, and this method comprises:
Launch a reference signal;
Receive report from least one communication equipment, wherein, this communication equipment is by the communication controler service; And wherein, this report comprises the indication of preferred pre-coding matrix;
Select down link (DL) transmission that is used for this communication equipment;
Be launching opportunity of this communication equipment scheduling, wherein this scheduling is based on the report that receives; And
This DL transmission is emitted to this communication equipment, and wherein, DL is transmitted in when launching opportunity occurring and launches.
2. the method for claim 1, wherein, the scheduled transmission chance is further based on the multi-user's gain and the combination thereof of the priority of the size of DL transmission, DL transmission, communication equipment priority, the transmission history of communication equipment, the quality that is used for the service request of communication equipment, communication equipment.
3. the method for claim 1, wherein the scheduled transmission chance comprises:
A) from one of a plurality of wave beam group selection; And
B) if the indicated preferred pre-coding matrix of communication equipment is corresponding with wave beam in the selected wave beam group, be communication equipment scheduled transmission chance.
4. method as claimed in claim 3, wherein, the scheduled transmission chance comprises the single wave beam that uses in the selected wave beam group, the DL transmission that scheduling will be launched.
5. method as claimed in claim 3, wherein, the scheduled transmission chance comprises will use the DL transmission that a plurality of beam dispaths will be launched in the selected wave beam group.
6. method as claimed in claim 3, wherein, the scheduled transmission chance is included in the part of the DL transmission that scheduling will be launched during the emission.
7. method as claimed in claim 3, wherein, the scheduled transmission chance is included on the wave beam corresponding with preferred pre-coding matrix or on the wave beam in the selected wave beam group, the DL that scheduling will be launched transmits.
8. method as claimed in claim 3, also comprise repeating step a) and b) be used for other wave beam groups of a plurality of wave beam groups.
9. the method for claim 1 also comprises with other communication scheduling devices and coordinates to determine wave beam group circulation pattern.
10. method as claimed in claim 9 wherein, is coordinated to comprise with other communication controlers and is shared report.
11. method as claimed in claim 9, wherein, the controller of coordinating to comprise with communication controler is shared report.
12. as, wherein, coordinate based on the layout of communication controler and the configuration of each communication controler by the described method of claim 9.
13. method as claimed in claim 9, wherein, scheduled transmission comprises:
Select the wave beam group based on wave beam group circulation pattern and launching opportunity; And
If the indicated preferred pre-coding matrix of communication equipment is corresponding with wave beam in the selected wave beam group, be communication equipment scheduled transmission chance.
14. one kind is used for the communication equipment method of operating, this method comprises:
Measurement is by the reference signal of communication controler emission, and wherein this communication controler is just being served this communication equipment;
Based on the measurement of reference signal, determine preferred pre-coding matrix;
Preferred pre-coding matrix is reported to this communication controler; And
Receive transmission from this communication controler, and this transmission is carried out precoding by preferred pre-coding matrix or with another pre-coding matrix that preferred precoding square belongs to identical wave beam group.
15. method as claimed in claim 14 wherein, reports that preferred pre-coding matrix comprises the indication of reporting preferred pre-coding matrix.
16. method as claimed in claim 14, wherein, pre-coding matrix is selected from code book.
17. method as claimed in claim 16, wherein, code book and communication controler are shared.
18. a communication controler comprises:
A processor that is configured to executive program and application program;
The circuit that transmits and receives that is coupled to processor and antenna, this transmits and receives circuit arrangement for handling transmission that receives and the transmission of preparing emission;
A scheduler that is coupled to processor, this scheduler is configured to, based on preferred pre-coding matrix by the communication node report, be dispatched to the transmission of at least one communication node, wherein, to being transmitted in of the communication node wave beam corresponding, dispatch, perhaps on the wave beam that belongs to the wave beam group that comprises the wave beam corresponding simultaneously, dispatch with preferred pre-coding matrix with preferred pre-coding matrix; And
Be coupled to the memory of processor, this memory is used for application storing, program and wave beam group.
19. communication controler as claimed in claim 18, wherein, processor also is configured to communicate to determine wave beam group circulation pattern with another communication controler.
20. communication controler as claimed in claim 18, wherein, processor also is configured to communicate to determine wave beam group circulation pattern with the controller of communication controler.
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| US14437009P | 2009-01-13 | 2009-01-13 | |
| US61/144,370 | 2009-01-13 | ||
| US12/686,043 US8396006B2 (en) | 2009-01-13 | 2010-01-12 | System and method for enabling wireless communications with cell coordination |
| US12/686,043 | 2010-01-12 | ||
| PCT/CN2010/070163 WO2010081413A1 (en) | 2009-01-13 | 2010-01-13 | System and Method for Enabling Wireless Communications with Cell Coordination |
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| CN102282885A true CN102282885A (en) | 2011-12-14 |
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| Publication number | Publication date |
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| US20100177725A1 (en) | 2010-07-15 |
| CN102282885B (en) | 2013-11-06 |
| US8396006B2 (en) | 2013-03-12 |
| WO2010081413A1 (en) | 2010-07-22 |
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